Engineering Mechanics Set 2

(4p ✘ (p ✘ (p ✔

Towards the wall at its upper end ✘ Away from the wall at its upper end ✘ Upwards at its upper end ✘ Downwards at its upper end ✔

Three forces acting at a point will be in equilibrium ✘ Three forces acting at a point can be represented by a triangle, each side being proportional to force ✘ If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium ✘ If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two ✔

Equal to one ✘ Less than one ✘ Greater than one ✘ None of these ✔

If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium ✘ If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium ✘ If a polygon representing forces acting at a point is closed then forces are in equilibrium ✘ If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium ✔

bh3/4 ✘ bh3/8 ✘ bh3/12 ✘ bh3/36 ✔

Angle between normal reaction and the resultant of normal reaction and the limiting friction ✘ Ratio of limiting friction and normal reaction ✘ The friction force acting when the body is just about to move ✘ The friction force acting when the body is in motion ✔

Coplanar concurrent forces ✘ Coplanar non-concurrent forces ✘ Non-coplanar concurrent forces ✘ Non-coplanar non-concurrent forces ✔

25 ✘ 50 ✘ 100 ✘ 250 ✔